And that force tends to cause it, if you have a moving charged particle, to deflect its trajectory and start rotating in a magnetic field.
这个力会产生这样的作用,有一个运动中的带电微粒,磁力会使其轨道偏转,并在磁场中做旋转。
And, so when we think of the trajectory of the moving point, that's called a parametric equation.
而当我们考虑运动点的轨迹的时候,轨迹可以称作是参数方程。
So, think of a line as the trajectory of a moving point.
把直线看作运动点的轨迹。
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